Description
The MAX155/MAX156 are high-speed, 8-bit, multichannel analog-to-digital converters (ADCs) with simultaneous track/holds (T/Hs) to eliminate timing differences between input channel samples. The MAX155 has 8 analog input channels and the MAX156 has 4 analog input channels. Each channel has its own T/H, and all T/Hs sample at the same instant. The ADC converts a channel in 3.6µs and stores the result in an internal 8×8 RAM. The MAX155/MAX156 also feature a 2.5V internal reference and power-down capability, providing a complete, sampling data-acquisition system.
MAX156 Functional Diagram
When operating from a single +5V supply, the MAX155/MAX156 perform either unipolar or bipolar, single-ended or differential conversions. For applications requiring wider dynamic range or bipolar conversions around ground, the VSS supply pin may be connected to -5V.
Conversions are initiated with a pulse to the active-low WR pin, and data is accessed from the ADC’s RAM with a pulse to the active-low RD pin. A bidirectional interface updates the channel configuration and provides output data. The ADC may also be wired for output-only operation.The MAX155 comes in 28-pin PDIP and wide SO packages, and the MAX156 comes in 24-pin narrow PDIP and 28-pin wide SO packages.
Key Features
8 Simultaneously Sampling Track/Hold Inputs
3.6µs Conversion Time Per Channel
Unipolar or Bipolar Input Range
Single-Ended or Differential Inputs
Mixed Input Configurations Possible
2.5V Internal Reference
Single +5V or Dual ±5V Supply Operation
Applications/Uses
AC Power Meters
DSP Analog Input
Phase-Sensitive Data Acquisition
Portable Data Loggers
Vibration and Waveform Analysis
Download the complete datasheet below
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